Q6600...big core temp differences

[Parja]

Got my Q6600 G0 fired up last night and after determining everything was running ok, headed straight for 9x333 @1.35V to get started on OCing this beast. Seems stable with Prime95 v25.4 so far, but per CoreTemp v.95, I'm seeing a pretty significant difference in core temperatures.

Cores 0 and 3 are stable at around 52C under full load while cores 1 and 2 are stable at around 44C...so about an 8C difference.

Are others seeing this kind of variation as well? It seems odd that 0/3 and 1/2 would have similar temps since the logical configuration would be 0 and 1 being on one die and 2 and 3 being on the other.

I applied AS5 with the line across the heatspreader in the orientation indicated on the AS website, so I think my technique was solid, but it's got me wondering.

Also, does anyone know the location of each specific die on the chip? If I pull my heatsink off, I'd like to be able to logically correlate the paste pattern and heatsink orientation back to the temps I was getting.

 

[annaconda]

Looks like your Core 0 & 3 are not making good contact with the HS.

 

[sabregen]

that's a normal temp difference between cores for a non-lapped CPUs.

 

[zombiebeat]

Lapping might, might, might even out your temps but under-load those are absolutely fine, even with the difference.

Its normal to see some discrepancy across cores, if it doesn't bother you then don't worry about it.

 

[cLOUDFAn]

mine also has 5~8c idle temp diff (load temps are pretty much the same amony 4 cores)
no big deal since neither the cpu nor the HS is lapped

 

[Parja]

Hmm, it's looking like numbering of the cores in CoreTemp is pretty random. I just fired it back up and cores 0 and 1 are running the same temp and cores 2 and 3 are running the same temp.